Virginia CDL Double/Triple Trailers Practice Test

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A driver couples a front trailer, opens the rear shut-off valves on that trailer, couples the dolly and rear trailer, then forgets to close the valves at the rear of the last trailer. What is the main risk?

The air system may lose pressure through the open rear valves The rear trailer will become heavier The dolly fifth wheel will automatically lock twice The electrical cord will overcharge

Correct Answer:

The air system may lose pressure through the open rear valves

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